novice programmer would very much welcome tips on how to 'de-jitter' noisy touch panel voltages:

using a stylus gives clean sharp repeatable voltages (I'm using the standard circuit for hacking these: pwr/gnd to one axis pair, read from one of the other, then invert and repeat for the other axis); using a finger causes 'ramp up' on contact, 'ramp down' on release. ie can someone recommend a method for averaging that isn't too slow. Here's my code